Moving issue/pr template to docs/. Added links in README.

.github/issue_template.md

@@ -1,42 +0,0 @@
-(Click "Preview" to turn any http URL into a clickable link)
-
-1. PLEASE CAREFULLY READ:
-https://github.com/ocornut/imgui/issues/2261
-
-2. IF YOU ARE HAVING AN ISSUE COMPILING/LINKING/RUNNING/DISPLAYING/ADDING FONTS, please post on the "Getting Started" Discourse forum:
-https://discourse.dearimgui.org/c/getting-started
-
-3. PLEASE MAKE SURE that you have: read the FAQ in imgui.cpp; explored the contents of ShowDemoWindow() including the Examples menu; searched among Issues; used your IDE to search for keywords in all sources and text files; and read the link provided in (1).
-
-4. Delete points 1-4 and PLEASE FILL THE TEMPLATE BELOW before submitting your issue. 
-
-----
-
-_(you may also go to Demo>About Window, and click "Config/Build Information" to obtain a bunch of detailed information that you can paste here)_
-
-**Version/Branch of Dear ImGui:**
-
-Version: XXX
-Branch: XXX _(master/viewport/docking/etc.)_
-
-**Back-end/Renderer/Compiler/OS** 
-
-Back-ends: imgui_impl_XXX.cpp + imgui_impl_XXX.cpp _(or specify if using a custom engine/back-end)_
-Compiler: XXX _(if the question is related to building or platform specific features)_
-Operating System: XXX 
-
-**My Issue/Question:** 
-
-XXX _(please provide as much context as possible)_
-
-**Screenshots/Video** 
-
-XXX _(you can drag files here)_
-
-**Standalone, minimal, complete and verifiable example:** _(see https://github.com/ocornut/imgui/issues/2261)_
-```
-// Please do not forget this!
-ImGui::Begin("Example Bug");
-MoreCodeToExplainMyIssue();
-ImGui::End();
-```